Mechanism for delineating cross-section contours.



MEGHANISM K. A. BDSTROM. POR DELIIIEATING CROSS SECTION GONTOURS.

APPLIGATION FILED MAY s, 1911.

Patented May 5, 1914.

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K. A. EDSTROM. MBGHANISM FOR DBLINEATING oRoss SECTION coNToURs.

APPLICATION FILED MAY 9, 1911. 1,095,31 '7 Patented May 5, 1914 Y 2 SHEETS-SHEET 2.

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aLwnBlA PLANOGRAPH Co.. WASHINGTON, D.

ED STy KARL A. EDSTROM, OF DENVER, COLORADO, ASSIGNOR OF TWO-FIFTHS TO OTTO HALKOWIEZ, OF DENVER, COLORADO.

MECHANISM FOR DELINEATING- CROSS-SECTION CO'NTOURS.

Specification of Letters Patent.

Patented May 5, i914.

Application led May 9, 1911. Serial No. 626,108.

To all 'whom t may concern:

Be it known that I, KARL A. EDsTRoM, a citizen of the United States of America, and

' a resident of the city and county of Denver yso hereinafter and State of Colorado, have invented cer tain new and useful improvements in Mechanism for Delineating Cross-Section Contours, of which the following is a specification.

My invention relates to a device for tracing upon a suitable surface such as paper, etc., the crosssection of any object which it may be desired to measure or duplicate.

For this purpose it comprises a tracing point and trailer point, the latter of which is adapted to run over the surface to be delineated, having a fixed relation to each other, but capable of conjointly moving in any direction in a plane, each being also capable of motion around its own pivotal point, to permit the reversal of the facing of the parts to operate upon opposite surfaces of the object being measured.

It also comprises a trailer capable of angular movement around an axis passing through the contact face of the trailer and means whereby the trailer will be automatically turned on this axis to permit the contact face of the trailer to be held in contact with the surfaces of the object which are parallel therewith.

It further consists in the construction, arrangement and combination of the several parts of which it is composed as will be more fully described and claimed.

Referring to the accompanying drawings in which corresponding parts are designated by corresponding marks of reference: Figure l is a front elevation, of a structure embodying my invention and showing in dotted lines a second position thereof. Fig. 2 is an end elevation thereof. Fig. 3 is an enlarged view of the trailer'l arm and trailer turner in another position. Fig. 4 s a horizoutal section on line @aL-m3 of Fig. 3.

The clamp l is of any approved construction adapted to receive and hold the object to be delineated and carries a plane table 2, on which, or on paper secured to which, the cross section of the object willbe drawn. The plane table has secured to its upper part a bracket 2, on which is pivoted the ends of the links 3 and 3, the opposite ends of which are pivoted to a disk Il, the links forming a. parallel motion device. The disk 4 has also pivoted thereto, but on the opposite side to that on which the links 3 are pivoted, and at an angle of ninety degrees therefrom, the ends of a second pair of links 5, the opposite ends of which are pivoted to the cross-head 6a of a frame 6, the links 5 also forming a parallel mot-ion device.

By the construction so far disclosed it will be seen that the frame 6 is capablevof motion in all directions in a plane parallel with the plane of the table 2, and in a plane which will in practice generally be at right angles to the longitudinal axis of the object being delineated.

To the upper part of the frame 6 a tracing arm 7 is pivoted intermediate of its length on an axis at right angles to the drafting plane, one extremity of the arm carrying a pencil or stylus 7a of any approved construction. The lower endof the frame 6 has pivoted thereto also on an axis at right angles tothe drafting plane a head 8, which may be locked in positions one hundred and eightyfdegrees apart by a spring bolt 8u carried by the frame and adapted to engage diametrically opposite recesses 8b in the plate 1l hereinafter referred to. An approximately horizontal trailer arm 9 is carried by the head in a bearing formed in the latter whose axis is parallel with the drafting plane, the arm 9 terminating in horizontal and vertical contact faces 9a and 9b which together form a Contact point 9l located in the prolongation of suoli axis. The trailer arm is capable of angular motion around such axis, but is normally locked in one of two diametrically opposite positions by means of a spring` lock 9d. The head has on that side thereof opposite the trailer arm a lateral extension 8C, to which is pivoted one end of an arm 10 which lextends therefrom along the side of the trailer arm and terminates ad]aceiit to the endv thereof in a finger 10a which projects above or below the contact face 9a of the latter. The arm 10 carries on itsV forward face a rack 10b which meshes with a pinion 9e formed on or secured to the trailer arm,v

whereby an angular movement of the arm l0 about its pivotal point will result in a rotation ot the trailer arm on its axis. The arm l() thus constitutes means for turningthe trailer, and is normally held lifted by a spring 10C. The trunnion 8d by which the head is carrie-d in the frame projects through the latter to the rear thereof where it receives a plate lll in which are the diamctrically opposite recesses 8b before referred to and which has a lever arm ll, whose treo end is connected to the corresponding end of the tracing arm 7, by the link lla, the conection being such that when the trailer arm is given an angular movement on the frame, the tracer arm will receive a similar movement.

rihe construction being as above described, the method of operating the device is as follows, it being presumed that the object whose cross section is to be depicted is a railway rail A held in the clamp l as shown, and that the parts are in the position shown in :tull lines in Fig. l, with the trailer contact tace 9@ and the end of the linger or' the trailer turner bearing in the bottom snrface ot the base of the rail: ris the trame G is moved horizontally toward the left the contact face of the trailer will run along the bottom and the stylus will receive a corresponding movement, drawing a straight line on the table 2. `When in this movement the linger l()n moves from beneath the base, the trailer turner arm l0 is lifted rapidly by the spring l()c and the trailer arm rotated through one hundred and eighty degrees, whereby the contact face 9a thereon will be reversed in position, to bear in the top face oi3 the web where the frame 6 is moved toward the right. inasmuch as the contact point 9C is in the prolongation of the axis on which the trailer arm turns, its position in space is not affected by this reversal. The trame is now moved upwardly and to the right to cause the contact faces to follow the contour of the rail, the tace 9" being the contact face for the vertical walls thereof. vll hen in this movement the linger 10 comes in Contact with the bottom et the head of the rail, (see Fig. 2) the trailer turner arm l0 will be again depressed on its pivot restoring the trailer arm to its previous condition with the tace 9a raised so that the contact point may be properly positioned.

lt will be noted that in the operation beiore described the movement of the tracer arm and head on their pivots are not used. rEhe function of such pivotal mounting is to permit the reversal ot the parts to permit them to be successively employed on opposite sides of the object. rlhus when in the movements before stated one side ot the rail has been delineated, the disk and trame 6 may be swung by the links 3 and 5 to the opposite side oit the board, and the head 8 and tracing arm each swung on their pivotal connection with the trame through an arc oi3 onehundred and eighty degrees whereby the parts will be properly positioned to follow on the opposite side of the object.

illhile in the above description the board is referred to as mounted above the object, it will be understood that it may be located to one side or below the same, and that in such event the relative location ot the parts to each other will partake of a similar change.

Having thus described my invention what l claim and desire to secure by Letters ljatent is l. In a device of the vcharacter specified, a trailer arm and a trailer turning arm mounted for movement together in a plane and being also capable oit independent movement, and mechanism whereby the trailer arm is rotated by the movement of the trailer turning arm.

2. In a device ol the character specified, a trailer arm and a trailer turning arm mounted for movement together in a plane and being also capable of independent movement, the trailer arm having a contact point and the trailer turner having a Contact linger adapted to be depressed by the object to be delineated, and connections between said arms tor rotating the trailer arm during` the depression of said linger.

3. In a device of the character specified, the combination with a trame movable in a plane, of a stylus and a trailer arm pivotally mounted on the frame, and connections between the trailer arm and the stylus whereby they may be reversed in position upon the frame and maintained in the saine relation to each other.

t. In a device of the character specified, the combination with a trame movable in a plane, of a stylus arm and a trailer arm pivotally mounted on the iframe, the trailer arm being also mounted for rotating motion, and having a Contact point located in its axis of rotation, and connections between the trailer arm and stylus whereby they may be rotated in position upon the frame and maintained in the same relation to each other.

5. In a device of the character specified, the combination with a trame movable in a plane, ot a stylus arm and head pivotally mounted on the frame, a connection between the arm and head whereby they may be reversed in position upon the trame and maintained in the same relation with each other, and a trailer arm journaled in the head and having a contact point located in its axis oit rotation.

6. ln a device oit the character specilied, the combination with a trame movable in a plane, ot a stylus arm and head pivotally mounted on the frame, a connection between the arm and head whereby they may be reversed in position upon the frame and maintained in the same relation with each other, a trailer arm journaled in the head and having a contact point located in its axis of rotation and means for locking the head on the frame in a plurality of positions.

7 In a device of the character specified, the combination with a frame movable in a plane, of a stylus arm and head pivotally mounted on the frame, a connection between the arm and head whereby they may be reversed in position upon the frame and maintained in the same relation with each other, a trailer arm journaled in the head and having a contact point located in its axis of rotation, a trailer turner pivoted to the head 15 In testimony whereof I hereunto sign my 2o name in the presence of two witnesses. KARL A. EDSTROM.

Witnesses:

F. A. SEBOLDT, A. I-I. ARoNsoN.

Copies o1' this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

